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As of September 2016, the International Union for Conservation of Nature (IUCN) lists 879 vulnerable mollusc species.[1] 12% of all evaluated mollusc species are listed as vulnerable. The IUCN also lists 18 mollusc subspecies as vulnerable.

14 extinct in the wild mollusc species (0.20%)581 critically endangered mollusc species (8.4%)507 endangered mollusc species (7.3%)879 vulnerable mollusc species (13%)535 near threatened mollusc species (7.7%)2437 least concern mollusc species (35%)1988 data deficient mollusc species (29%)
Mollusc species (IUCN, 2020.1)
  • 6941 extant species have been evaluated
  • 4953 of those are fully assessed[lower-alpha 1]
  • 2972 are not threatened at present[lower-alpha 2]
  • 1967 to 3955 are threatened[lower-alpha 3]
  • 324 to 441 are extinct or extinct in the wild:
    • 311 extinct (EX) species[lower-alpha 4]
    • 13 extinct in the wild (EW)
    • 117 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. excludes data deficient evaluations.
  2. NT, LR/cd, LC.
  3. Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. Chart omits extinct (EX) species
Vulnerable (VU) species are considered to be facing a high risk of extinction in the wild.
Vulnerable (VU) species are considered to be facing a high risk of extinction in the wild.

No subpopulations of molluscs have been evaluated by the IUCN.

For a species to be assessed as vulnerable to extinction the best available evidence must meet quantitative criteria set by the IUCN designed to reflect "a high risk of extinction in the wild". Endangered and critically endangered species also meet the quantitative criteria of vulnerable species, and are listed separately. See: List of endangered molluscs, List of critically endangered molluscs. Vulnerable, endangered and critically endangered species are collectively referred to as threatened species by the IUCN.

Additionally 1988 mollusc species (27% of those evaluated) are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN.[2] While the category of data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed."[3]

This is a complete list of vulnerable mollusc species and subspecies evaluated by the IUCN.


Gastropods


There are 828 species and 16 subspecies of gastropod assessed as vulnerable.


Stylommatophora


Stylommatophora includes the majority of land snails and slugs. There are 339 species and six subspecies in the order Stylommatophora assessed as vulnerable.


Charopids


Helicarionids


Orthalicids


Euconulids


Streptaxids


Ferussaciids


Helminthoglyptids


Oxychilids


Camaenids


Lauriids


Vertiginids

Species

Subspecies


Trissexodontids


Helicids

Species

Subspecies


Hygromiids

Species

Subspecies


Vitrinids


Chondrinids


Enids


Other Stylommatophora

Species

Subspecies


Littorinimorpha


There are 324 species and seven subspecies in the order Littorinimorpha assessed as vulnerable.


Hydrobiids

Species

Subspecies


Cochliopids


Bithyniids


Moitessieriids


Assimineids


Pomatiopsids


Amnicolids


Other Littorinimorpha species


Sorbeoconcha


There are 55 species in the order Sorbeoconcha assessed as vulnerable.


Pleurocerids


Melanopsids


Thiarids


Pachychilids


Paludomids


Architaenioglossa


Species

Subspecies


Lower Heterobranchia species



Cycloneritimorpha



Hygrophila


Species

Subspecies


Neogastropoda



Conids


Eupulmonata



Bivalvia


There are 49 species and two subspecies in the class Bivalvia assessed as vulnerable.


Unionida


There are 37 species and two subspecies in the order Unionoida assessed as vulnerable.


Margaritiferids


Unionids

Species

Subspecies


Hyriids


Iridinids

Species

Subspecies


Mycetopodids


Cardiida



Arcida



Venerida



Cephalopods



See also



References


  1. "IUCN Red List version 2016-2". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 8 September 2016.
  2. "Limitations of the Data". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.
  3. "2001 Categories & Criteria (version 3.1)". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.


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